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Upper‐Phase Stability Limit of Bi‐2212
Author(s) -
MacManusDriscoll J. L.,
Li Y. H.,
Yi Z.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02906.x
Subject(s) - alkaline earth metal , decomposition , analytical chemistry (journal) , annealing (glass) , chemistry , oxygen , phase (matter) , partial pressure , titration , mineralogy , inorganic chemistry , materials science , alkali metal , metallurgy , environmental chemistry , organic chemistry
The upper stability line for Bi 2 Sr 2 CaCu 2 O 8+α (Bi‐2212) was determined over the temperature range 540°–800°C and the oxygen partial pressure range 1.5 ×10 1 ‐7.4× 10 ‐3 atm using coulometric titration and high oxygen pressure annealing. The decomposition products resulting from Bi‐2212 oxidation are CuO, two alkaline‐earth bismuthates, and the Raveau phase, Bi 11 Sr 9 Cu 5 O y . The main alkaline‐earth bismuthate is a known phase of cation composition Bi:Sr:Ca = 2.00:2.48:1.19 (Bi:Sr:Ca 9:11:5). The other alkaline‐earth bismuthate is a minor phase of cation composition Bi:Sr:Ca = 2.00:0.53:0.39. The kinetics for Bi‐2212 decomposition are very slow; e.g., at 700°C in air, the reaction is incomplete after 7 days.